Laminated glass for vehicle window

Abstract

To provide a laminated glass for a vehicle window which can prevent the temperature increase in a vehicle. A laminated glass for a vehicle window which comprises a glass plate 12 to be disposed on the car exterior side when the laminated glass 1 is assembled in a vehicle, and an infrared reflection film 21 provided on the side of an infrared shielding interlayer 30 having infrared shielding fine particles dispersed therein, of the glass plate 12 , wherein the reflectance to light at all wavelengths of from 900 to 1,100 nm is from 30 to 50%, the absorptivity to light at all wavelengths of from 1,100 to 1,300 nm is from 35 to 60%, and the transmittance to light at all wavelengths of from 900 to 1,500 nm is at most 30%.

1. A laminated glass for a vehicle window, which comprises a first glass plate, a second glass plate having an infrared reflection film having a sheet resistance of at least 1 kΩ/□, and an interlayer having infrared shielding fine particles dispersed therein, interposed between the first glass plate and the second glass plate, the first glass plate being disposed on the car interior side,
 wherein the infrared reflection film comprises a stacked coating film (X) and a thin film (Y), 
 the stacked coating film (X) has a coating film ( 1 ) made of a high refractive index inorganic material having a refractive index of at least 1.90 and a coating film ( 2 ) made of a low refractive index inorganic material having a refractive index of at most 1.56 wherein, from the glass plate side, beginning with coating film ( 1 ), coating film ( 1 ) and coating film ( 2 ) are alternately stacked, and the total number of coating film ( 1 ) and coating film ( 2 ) in stack (X) is at least 3; and 
 coating film ( 1 ) has a geometrical thickness of 70 to 150 nm, and coating film ( 2 ) has a geometrical thickness of 100 to 200 nm, 
 the thin film (Y) has a multilayer structure made of an inorganic material on the non-glass plate side of the stacked coating film (X), 
 the thin film (Y) and the coating film of the stacked coating film (X) are in contact with each other; and 
 the thin film (Y) is a multilayer film having a high refractive index layer (c) made of a high refractive index inorganic material having a refractive index of at least 1.90 and having a geometrical thickness of from 5 to 40 nm and a low refractive index layer (d) made of a low refractive index inorganic material having a refractive index of at most 1.56 and having a geometrical thickness of from 5 to 40 nm alternately stacked in a totally even number of layers, and the layer in contact with the coating film ( 1 ) of the stacked coating film (X) is the low refractive index layer (d). 
 
     
     
       2. The laminated glass for a vehicle window according to  claim 1 , wherein at least one coating film ( 1 ) is a single layer film ( 1   a ) of titanium oxide or titanium oxynitride. 
     
     
       3. The laminated glass for a vehicle window according to  claim 1 , wherein at least one coating film ( 1 ) is a high refractive index multilayer film ( 1   b ) having a multilayer structure comprising at least two layers made of different high refractive index inorganic materials, and at least one layer of the high refractive index multilayer film ( 1   b ) is a layer of titanium oxide or titanium oxynitride. 
     
     
       4. The laminated glass for a vehicle window according to  claim 3 , wherein at least one layer of the high refractive index multilayer film ( 1   b ) is a layer of titanium oxide or titanium oxynitride, and at least one other layer of the high refractive index multilayer film ( 1   b ) is a layer of zirconium oxide. 
     
     
       5. The laminated glass for a vehicle window according to  claim 1 , wherein the coating film (X) comprises two high refractive index multilayer coating films ( 1   b - 1 ) containing a layer of zirconium oxide and a layer of titanium oxide or titanium oxynitride, having a total geometrical thickness of from 70 to 150 nm, and the coating film ( 2 ) present between the two high refractive index multilayer coating films ( 1   b - 1 ). 
     
     
       6. The laminated glass for a vehicle window according to  claim 1 , wherein the coating film ( 2 ) is a layer of silicon oxide. 
     
     
       7. The laminated glass for a vehicle window according to  claim 1 , wherein the high refractive index layer (c) of the thin film (Y) is a layer of titanium oxide, and the low refractive index layer (d) of the thin film (Y) is a layer of silicon oxide. 
     
     
       8. The laminated glass for a vehicle window according to  claim 1 , wherein the geometrical thickness of the high refractive index layer (c) of the thin film (Y) is from 7 to 11 nm, and the geometrical thickness of the low refractive index layer (d) of the thin film (Y) is from 25 to 35 nm. 
     
     
       9. The laminated glass for a vehicle window according to  claim 1 , wherein with respect to light incident from the second glass plate side, the reflectance to light at all wavelengths of from 900 to 1,100 nm is from 30 to 50%, the absorptivity to light at all wavelengths of from 1,100 to 1,300 nm is from 35 to 60%, and the transmittance to light at all wavelengths of from 900 to 1,500 nm is at most 30%. 
     
     
       10. The laminated glass for a vehicle window according to  claim 1 , wherein with respect to light incident from the second glass plate side, the reflectance to light at all wavelengths of from 900 to 1,100 nm is from 30 to 50%, the absorptivity to light at all wavelengths of from 1,100 to 1,300 nm is from 40 to 60%, and the transmittance to light at all wavelengths of from 900 to 1,500 nm is at most 30%. 
     
     
       11. The laminated glass for a vehicle window according to  claim 1 , wherein with respect to light incident from the second glass plate side, the reflectance to light at a wavelength of 900 nm is from 20 to 40%, the reflectance to light at all wavelengths of from 1,000 to 1,100 nm is from 30 to 50%, the absorptivity to light at all wavelengths of from 1,100 to 1,300 nm is from 35 to 60%, and the transmittance to light at all wavelengths of from 900 to 1,500 nm is at most 30%. 
     
     
       12. The laminated glass for a vehicle window according to  claim 9 , wherein with respect to light incident from the second glass plate side, the absorptivity to light at all wavelengths of from 900 to 1,100 nm is from 30 to 50%. 
     
     
       13. The laminated glass for a vehicle window according to  claim 9 , wherein with respect to light incident from the second glass plate side, the reflectance to light at all wavelengths of from 1,100 to 1,300 nm is from 20 to 40%. 
     
     
       14. The laminated glass for a vehicle window according to  claim 1 , which has a visible light transmittance to light incident from the second glass plate side of at least 70%.